By Duane W.
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Extra info for On the Calculation of the X-Ray Absorption Frequencies of the Chemical Elements (Second Note)
Lead aerosol in the air is poisonous to breathe, especially for young children. Many people called for the abolition of lead in gasoline. In the 1970s, the photochemical smog in California was attributed to unburned hydrocarbons and carbon monoxide from automobile tailpipes, and the best solution was the catalytic converter which works with ﬁnely divided platinum particles deposited on alumina monoliths. When leaded gasoline is used, these platinum atoms would be quickly covered by a barrage of lead aerosols.
Philips. 1988. The Kevlar Story. DuPont presentation at Advanced Material Conference, Hotel DuPont, Wilmington, DE. Wilson, R. E. 1937. Perkin Medal: the Medalist. Industrial and Engineering Chemistry 29(2): 239–241. Wolf, R. F. 1939. India Rubber Man: The Story of Charles Goodyear. Caldwell, ID: Caxton Printers. Further Reading Bowden, M. E. 1997. Chemical Achievers. Philadelphia: Chemical Heritage Foundation. Bowden, M. E. and J. K. Smith. 1994. American Chemical Enterprise. Philadelphia, PA: Chemical Heritage Foundation.
By 1939 he had screened 349 compounds, and his 350th compound was dichlorodiphenyltrichloroethane (DDT). Spraying DDT on the ﬂies in his glass cage, Müller saw them fall helplessly onto their backs in 10 min. His cage remained poisonous for weeks and killed any ﬂy that touched its walls. DDT works slowly but has a sure kill with tremendous persistence. It is a cheap contact poison without objectionable odors, it is stable in air and light, it is effective in extremely small doses, and it dissolves poorly in water, so that warm-blooded organisms absorb only traces of it.